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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2effa2578328873b397149de6ec0d59f725df987204dc0ef7e50b3f5dff076' 
  AND token = 'PeMN1TZMZKy1wHFB9RiF5AqmlaY4Lia1Cc7+yYE/X0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}